Heads
Thin film
data
heads in the RDA write and read user data. An additional thin film head in
each unit is used
to
recover the servo information.
Actuator
and
Latch
Assembly
A rotary actuator positions the heads. A shipping latch captures the
actuator
arm
at
the
inside diameter of the disks (away from user data) whenever power is removed from
the
disk
drive. This prevents the heads from moving over
data
until power is applied
and
the
disks
are spinning, causing
the
heads to
fly
at
a safe distance above
the
disk surfaces. During
the
power-up sequence, the processor releases
the
latch, allowing normal movement of
the
heads.
Head
Interface
Electronics
The head interface circuits (located inside the RDA), process
the
data
signals transferred
between the read/write heads and the drive electronics/controller
peA.
These circuits include
write drivers which provide the necessary current
to
the heads during write operations, and
read preamplifiers
that
amplify
data
read from
the
disk before transferring
it
to
the
read/write
circuit on the drive electronics/controller
peA.
Additional functions performed by
the
head
interface include head selection and write control.
Atmospheric
Controls
The atmospheric controls in the RDA consist of a breather filter and a recirculating filter.
The breather filter equalizes air pressure within the RDA to ambient air pressure
and
prevents contaminants from entering the RDA. The recirculating filter maintains the internal
cleanliness of
the
RDA.
Vibration
Isolators
The RDA is mounted on vibration isolators
to
protect
it
from high frequency external
vibrations.
Spindle
Assembly
The spindle assembly provides the mechanical mounting for the disks. The spindle rotates on
a bearing system and is driven by an "in
hub" brushless
dc
motor.
The
drive current for the
motor is supplied by the spindle driver circuit on the drive electronics/controller
peA.
DRAFT
Product
Features 3·7
1/18/93 09:58
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